Portable Transformer Capacity Characteristics Tester

The MOEORW-WBT67 is a portable comprehensive tester specifically designed to address the on-site challenges of distribution transformer testing. It is commonly referred to as a transformer capacity tester, transformer characteristics tester, or transformer energy efficiency detector. Integrating capacity determination, no-load loss measurement, load loss measurement, and harmonic analysis into a single unit, it replaces multiple single-function instruments found on traditional test benches. It is particularly suited for field operations in outdoor environments, industrial plants, and remote substations where external AC test power is unavailable.

The device comes pre-loaded with a complete national standard database. It functions not merely as a testing tool but as a mobile transformer type identification system. Whether applied to 10kV distribution transformers, 35kV or 110kV large power transformers, dry-type transformers, amorphous alloy transformers, or single-phase distribution transformers, the instrument delivers rapid determination results and directly displays deviations from standard values, assisting users in verifying whether the equipment meets energy efficiency access requirements.

As a professional-grade portable transformer comprehensive test console, the WBT67 offers a voltage measurement range of 0 to 750V and a current range of 0 to 100A, with basic accuracy of ±0.2% of reading. Power measurement error is less than ±(0.5% of reading + 0.05% of range) at COSΦ=0.5~1.0, and less than ±(1.0% of reading + 0.1% of range) at COSΦ=0.2~0.5. These specifications place it among the top performers in its class of portable transformer characteristics testers.

The wide-range design eliminates the need for frequent external sensor swaps, covering the vast majority of 10kV/20kV distribution transformer test requirements. When dealing with 110kV-class or larger capacity transformers, the instrument supports external CT and PT connections, extending the capacity measurement upper limit to 80,000kVA. All displayed data are directly read values after conversion, requiring no manual calculation and thus avoiding human error. This flexible scalability makes the WBT67 equally suitable for routine inspections and large-scale installation and commissioning projects.

Fully Self-Contained Power System – Eliminating On-Site Power Supply Constraints

Traditional capacity testing relies on external voltage regulators and AC power sources. The WBT67 itself serves as a mobile power station. It incorporates a 16.8V/6000mAh high-capacity lithium battery pack and a three-phase sine-wave inverter power supply (rated output 100VA, 5A/50Hz). With no external AC power available, it independently outputs test power to complete transformer capacity testing. This feature distinguishes it from ordinary transformer capacity testers, truly achieving "one instrument, no external assistance" for standalone field operations.

The battery management system monitors remaining charge in real time with percentage display and actively prompts charging when the level drops below 20%. An over-discharge protection function prevents premature battery aging due to deep discharge, extending overall service life. The charger adapter supports 100-240V wide voltage input for global compatibility, with an automatic color-changing indicator upon full charge.

Intelligent Determination Algorithm – Accurate Under Non-Rated Conditions

Transformers often operate at off-nominal tap positions in practice, while conventional instruments require testing strictly at the rated tap, otherwise results deviate significantly. The WBT67 incorporates a tap deviation compensation algorithm. Users simply select the current tap deviation (16 steps from -10% to +10%) in the parameter interface, and the instrument automatically converts test results to the rated tap condition without manual correction factors.

In load testing, when the test power supply capacity is insufficient, users can set the applied current to 30%~100% of rated value (in 10% increments). The instrument automatically converts short-circuit loss and impedance voltage to rated current values and simultaneously to the specified reference temperature (75°C default for oil-immersed types; 80°C, 95°C, 100°C, 120°C, or 145°C selectable for dry-type based on insulation class). This capability elevates the WBT67 beyond a mere characteristics tester in the eyes of users, establishing it as an intelligent analytical terminal with "back-calculation" capabilities.

Complete National Standard Database – Automatic Type Identification

The core algorithm of this transformer energy efficiency detector covers:

10kV class: S7~S22, SZ7~SZ13, SH15~SH25, D9~D13, DH15, as well as all mainstream dry-type and amorphous models including SC(B)8~SC(B)19, SC(B)H15~H19, SG(B)8~SG(B)18, SG(B)H15~H19;

20kV class: S11, S12, S13, SH15;

35kV class: S7~S13, SH15, SZ7~SZ11.

Upon test completion, the interface directly displays the determination result: "Type Determined: S13-M, Capacity Determined: 500kVA, Deviation: -1.2%", along with side-by-side comparisons of standard no-load loss, standard load loss, standard impedance voltage, and measured values. For non-standard or furnace transformers, users may manually input rated impedance, and the instrument still provides a reference determination. This feature enables the device to function dually as a transformer capacity tester and a type identification apparatus.

Complete Characteristics Test Capabilities – No-Load, Load, and Harmonic Analysis in One

Unlike simple instruments that measure capacity only, the WBT67 offers comprehensive transformer characteristics testing functions:

No-Load Test: Automatically captures and locks data at the set voltage point, eliminating the need for manual meter-watching. Within 90%~110% of rated voltage, automatic voltage correction converts results to rated voltage conditions.

Load Test: Supports reduced-current measurement with automatic conversion to rated current. Based on the input primary/secondary DC resistance values, it separately provides both "direct conversion" and "DC resistance conversion" results for comparison.

Harmonic Analysis: Real-time monitoring of 2nd to 25th harmonic content in voltage and current, presented in both data reports and bar charts. This functionality aids in diagnosing whether grid harmonic pollution causes additional heating or vibration in transformers, providing a basis for fault troubleshooting.

The MOEORW-WBT67 is designed from the ground up to cover the full lifecycle testing requirements of distribution transformers. Typical applications include but are not limited to:

Power Utility Operation and Maintenance Departments: Periodic energy efficiency re-verification of in-service distribution transformers, screening for high-loss transformers, phasing out obsolete models such as S7 and S9, and providing on-site data support for energy-saving retrofits.

Transformer Manufacturing Plant Factory Testing: Rapid capacity re-verification and no-load/load spot checks after final assembly, eliminating the need for large-scale test stations and reducing initial capital investment.

Electrical Maintenance Workshops in Large Industrial and Mining Enterprises: Annual inspections or post-fault re-testing of main transformers, rectifier transformers, and furnace transformers within captive substations, ensuring timely awareness of equipment health status.

Power Engineering Installation and Commissioning Sites: Acceptance testing prior to commissioning of newly installed transformers, on-site verification that nameplate capacity matches actual characteristics, preventing commissioning incidents caused by supplier mis-shipments or incorrect nameplate labeling.

Third-Party Testing and Supervision Agencies: Serving as a universal platform for witnessed testing on-site, issuing impartial data with real-time printouts and exportable reports via backend systems.

Renewable Energy Projects (Wind/PV Booster Stations): On-site energy efficiency verification of dry-type and amorphous alloy transformers, meeting the stringent loss access requirements of green power projects.

Standard factory package includes:
MOEORW-WBT67 Main Unit × 1
Specialized Test Clamps (Yellow/Green/Red, four-terminal structure with independent current and voltage leads) × 3
Low-Voltage Shorting Bar (for 10kV distribution transformer LV side short-circuit) × 1
16.8V/1.5A Smart Charger × 1
Thermal Printing Paper × 2 rolls
USB Data Cable × 1
Portable Engineering Protective Carrying Case × 1
Factory Calibration Report / Certificate of Conformity / User Manual (electronic version stored on USB drive)
Main unit dimensions: 320×240×130 (mm). Portable hand-carry design, suitable for frequent on-site movement and use.